35,185 reputation
53074
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location Vienna, Austria
age
visits member for 3 years, 4 months
seen 18 hours ago

If you have been following me around, you know that my main interests are general topology, set theory, and destroying users who post nothing but inane gibberish. The last is certainly not the least!


Projects I'd like to spend some time on:

  1. replace all occurrences of "Erdös" and "Erdos" by "Erdős"
  2. completely separate the and tags (i.e., empty this list).

1d
revised Understanding a proof of Wedderburn's little theorem
MathJaxified
1d
comment linear programming, product mix
Do not deface your posts. It is quite disrespectful to the people who have taken the time to provide you with answers.
1d
revised linear programming, product mix
rolled back to a previous revision
2d
comment A question on the proof of 14 distinct sets can be formed by complementation and closure
Smallish quibble: There are 15 such strings of length at most seven: the empty string is among them. If $gfgfgfgf = gfgf$, it follows that $fgfgfgf = ggfgfgfgf = ggfgf = fgf$.
2d
comment A question on the proof of 14 distinct sets can be formed by complementation and closure
Why did you not include $fgf$ in your list?
2d
revised continuous functional
removed link to illegal copy of book
2d
comment Prove that intersection of connected spaces is connceted.
@TheonAlexander: You suggested an edit to this question, which I rejected. It is not the place of users to ensure that the statements in questions are true: counterexamples (especially unexpected ones) are very important to learning mathematics. (While there is a possibility that the OP was genuinely confused about the meaning of "intersection" and "$\cap$" and actually meant to ask about the "correct" statement, so far there is no actual evidence of this, and as such your edit was far too radical.)
2d
reviewed Reject suggested edit on Prove that intersection of connected spaces is connceted.
Jul
22
answered If $A=[0, 1] \times (0, 1)$, which is a subspace of $I^2 = [0, 1] \times [0, 1],$ how are the sets $U_x = \{x\} \times (0, 1)$ open in $A$?
Jul
22
revised How are $\pi/4$ and $3\pi/4$ solutions to $\sec^2 \theta -2 = 0$?
Added unnecessary (and IMHO inflammatory) statements.
Jul
22
revised Linear algebraic group
rolled back to a previous revision
Jul
22
revised Linear algebraic group
rolled back to a previous revision
Jul
22
revised Copy of C in H , trace is independent of the choice
rolled back to a previous revision
Jul
22
revised Show that exponential map is surjective
rolled back to a previous revision
Jul
22
revised Show that exponential map is surjective
rolled back to a previous revision
Jul
22
revised Show that exponential map is surjective
rolled back to a previous revision
Jul
21
revised How is this exactly equal to $N_1+N_2+\dots+N_r$?
edited tags
Jul
21
revised Is there an uncountable scattered subset of $\mathbb R$?
retitled; improved formatting; removed irrelevant descriptive-set-theory and set-theory tags
Jul
21
revised Is there an uncountable scattered subset of $\mathbb R$?
edited for clarity
Jul
21
answered Is there an uncountable scattered subset of $\mathbb R$?